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https://www.readbyqxmd.com/read/28445031/importance-of-loop-l1-dynamics-for-substrate-capture-and-catalysis-in-pseudomonas-aeruginosa-d-arginine-dehydrogenase
#1
Daniel Ouedraogo, Michael Souffrant, Sheena Vasquez, Donald Hamelberg, Giovanni Gadda
Mobile loops located at the active site entrance in enzymes often participate in conformational changes required to shield the reaction from bulk solvent, to control substrate access to the active site, and to position residues for substrate binding and catalysis. In D-arginine dehydrogenase from Pseudomonas aeruginosa (PaDADH) previous crystallographic data suggested that residues 45-47 in the FAD-binding domain and 50-56 in the substrate-binding domain in loop L1 could adopt two distinct conformations. In this study, we have used molecular dynamics, kinetics, and fluorescence spectroscopy on the S45A and A46G enzyme variants of PaDADH to investigate the impact of mutations of loop L1 on the catalytic function of the enzyme...
April 26, 2017: Biochemistry
https://www.readbyqxmd.com/read/28445009/evaluation-of-six-phenotypic-methods-for-the-detection-of-carbapenemases-in-gram-negative-bacteria-with-characterized-resistance-mechanisms
#2
Kunling Sun, Xiuyu Xu, Jinrong Yan, Liping Zhang
BACKGROUND: We compared the performance of the modified Hodge test (MHT), Triton Hodge test (THT), Carba NP test (CNPt), simplified Carba NP test (CNPt-direct), blue-Carba NP test (BCT), and carbapenem inactivation method (CIM) for rapid and accurate carbapenemase detection. METHODS: The methods were evaluated by using 256 gram-negative isolates, including 197 Enterobacteriaceae (79 Enterobacter spp., 74 Klebsiella spp., 33 Escherichia coli, 10 Citrobacter spp., and 1 Serratia marcescens), 51 Acinetobacter baumannii, and 8 Pseudomonas aeruginosa strains...
July 2017: Annals of Laboratory Medicine
https://www.readbyqxmd.com/read/28444894/species-ecological-similarity-modulates-the-importance-of-colonization-history-for-adaptive-radiation
#3
Jiaqi Tan, Xian Yang, Lin Jiang
Adaptive radiation is an important evolutionary process, through which a single ancestral lineage rapidly gives rise to multiple newly formed lineages that specialize in different niches. In the first-arrival hypothesis, David Lack emphasized the importance of species colonization history for adaptive radiation, suggesting that the earlier arrival of a diversifying species would allow it to radiate to a greater extent. Here, we report on the first rigorous experimental test of this hypothesis, using the rapidly evolving bacterium Pseudomonas fluorescens SBW25 and six different bacterial competitors...
April 26, 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/28444568/effect-of-phosphorus-addition-on-the-reductive-transformation-of-pentachlorophenol-pcp-and-iron-reduction-with-microorganism-involvement
#4
Yongkui Wang, Xianli Liu, Jiexun Huang, Wensheng Xiao, Jiaquan Zhang, Chunqin Yin
The transformation of phosphorus added to the soil environment has been proven to be influenced by the Fe biochemical process, which thereby may affect the transformation of organic chlorinated contaminants. However, the amount of related literatures regarding this topic is limited. This study aimed to determine the effects of phosphorus addition on pentachlorophenol (PCP) anaerobic transformation, iron reduction, and paddy soil microbial community structure. Results showed that the transformation of phosphorus, iron, and PCP were closely related to the microorganisms...
April 25, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28444566/improvement-of-rice-seedling-growth-and-nitrogen-use-efficiency-by-seed-inoculation-with-endophytic-denitrifiers
#5
Wenfeng Wang, Yanyan Zhai, Lixiang Cao, Hongming Tan, Renduo Zhang
The aim of the present study is to investigate the effect of seed inoculation with endophytic denitrifiers on rice seedling growth and nitrogen use efficiency under low- and high-urea conditions. Pseudomonas sp. B2, Streptomyces sp. A9, and Fusarium sp. F3 were isolated from rice plant tissues. Rice seeds inoculated with the denitrifiers were sown in soil fertilized with 100 and 300 mg/kg urea concentrations, respectively. The denitrifiers increased soil ammonia concentrations or kept high ammonia concentration for a longer time in soils...
April 25, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28444395/effects-of-n-acetyl-l-cysteine-on-the-membrane-vesicle-release-and-growth-of-respiratory-pathogens
#6
Charlotte Volgers, Birke J Benedikter, Gert E Grauls, Pauline H M Hellebrand, Paul H M Savelkoul, Frank R M Stassen
Bacterial infections contribute to the disease progression of chronic obstructive pulmonary disease (COPD) by stimulating mucus production in the airways. This increased mucus production and other symptoms are often alleviated when patients are treated with mucolytics such as N-acetyl-L-cysteine (NAC). Moreover, NAC has been suggested to inhibit bacterial growth. Bacteria can release membrane vesicles in response to stress and recent studies report a role for these pro-inflammatory membrane vesicles (MVs) in the pathogenesis of airways disease...
April 21, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28444073/antibacterial-activity-of-standard-and-n-doped-titanium-dioxide-coated-endotracheal-tubes-an-in-vitro-study
#7
Valentina Caratto, Lorenzo Ball, Elisa Sanguineti, Angelo Insorsi, Iacopo Firpo, Stefano Alberti, Maurizio Ferretti, Paolo Pelosi
Objective: The aim of this study was to assess the antibacterial activity against Staphylococcus aureus and Pseudomonas aeruginosa of two nanoparticle endotracheal tube coatings with visible light-induced photocatalysis. Methods: Two types of titanium dioxide nanoparticles were tested: standard anatase (TiO2) and N-doped TiO2 (N-TiO2). Nanoparticles were placed on the internal surface of a segment of commercial endotracheal tubes, which were loaded on a cellulose acetate filter; control endotracheal tubes were left without a nanoparticle coating...
January 2017: Revista Brasileira de Terapia Intensiva
https://www.readbyqxmd.com/read/28443385/pseudomonas-aeruginosa-prevalence-antibiotic-resistance-and-antimicrobial-use-in-chinese-burn-wards-from-2007-to-2014
#8
Yi Dou, Jingning Huan, Feng Guo, Zengding Zhou, Yan Shi
Objective To assess the application of antibacterial agents, alongside pathogen prevalence and Pseudomonas aeruginosa drug resistance, with the aim of understanding the impact of inappropriate antibacterial use. Methods This retrospective study assessed bacteria from wounds, catheters, blood, faeces, urine and sputum of hospitalized patients in burn wards between 2007 and 2014. The intensity of use of antibacterial agents and resistance of P. aeruginosa to common anti-Gram-negative antibiotics were measured...
January 1, 2017: Journal of International Medical Research
https://www.readbyqxmd.com/read/28443365/enhanced-phosphorus-reduction-in-simulated-eutrophic-water-a-comparative-study-of-submerged-macrophytes-sediment-microbial-fuel-cells-and-their-combination
#9
Peng Xu, Enrong Xiao, Dan Xu, Juan Li, Yi Zhang, Zhigang Dai, Qiaohong Zhou, Zhenbin Wu
The phosphorus content reduction in overlying and sediment pore water was attempted by integrating sediment microbial fuel cells (SMFCs) with the submerged macrophyte Vallisneria spiralis. A comparative study was conducted to treat simulated water rich in phosphate with a control and three treatments: SMFC alone (SMFC), submerged macrophytes alone (macophyte), and combined macrophytes and fuel cells (M-SMFC). All treatments increased sediment Eh and pH of the overlying water, thus promoting phosphorus flux from water column to sediments...
April 26, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28443279/analogs-of-the-frog-skin-antimicrobial-peptide-temporin-1tb-exhibit-a-wider-spectrum-of-activity-and-a-stronger-antibiofilm-potential-as-compared-to-the-parental-peptide
#10
Lucia Grassi, Giuseppantonio Maisetta, Giuseppe Maccari, Semih Esin, Giovanna Batoni
The frog skin-derived peptide Temporin 1Tb (TB) has gained increasing attention as novel antimicrobial agent for the treatment of antibiotic-resistant and/or biofilm-mediated infections. Nevertheless, such a peptide possesses a preferential spectrum of action against Gram-positive bacteria. In order to improve the therapeutic potential of TB, the present study evaluated the antibacterial and antibiofilm activities of two TB analogs against medically relevant bacterial species. Of the two analogs, TB_KKG6A has been previously described in the literature, while TB_L1FK is a new analog designed by us through statistical-based computational strategies...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28442601/crystal-structure-of-thermostable-alkylsulfatase-sdsap-from-pseudomonas-sp-s9
#11
Lifang Sun, Pu Chen, Yintao Su, Zhixiong Cai, Lingwei Ruan, Xun Xu, Yunkun Wu
A novel alkylsulfatase from bacterium Pseudomonas sp. S9 (SdsAP) was identified as a thermostable alkylsufatases (type III) which could hydrolyze the primary alkyl sulfate such as sodium dodecyl sulfate (SDS). Thus, it has a potential application of SDS bio-degradation. The crystal structure of SdsAP has been solved to a resolution of 1.76 Å and reveals that SdsAP contains the characteristic metallo-β-lactamase like fold domain, dimerization domain and C-terminal sterol carrier protein type 2 like (SCP-2-like) fold domain...
April 25, 2017: Bioscience Reports
https://www.readbyqxmd.com/read/28442545/peroxisome-proliferator-activated-receptor-%C3%AE-agonists-attenuate-biofilm-formation-by-pseudomonas-aeruginosa
#12
Brahmchetna Bedi, Nicholas M Maurice, Vincent T Ciavatta, K Sabrina Lynn, Zhihong Yuan, Samuel A Molina, Myungsoo Joo, William R Tyor, Joanna B Goldberg, Michael H Koval, C Michael Hart, Ruxana T Sadikot
Pseudomonas aeruginosa is a significant contributor to recalcitrant multidrug- resistant infections, especially in immunocompromised and hospitalized patients. The pathogenic profile of P. aeruginosa is related to its ability to secrete a variety of virulence factors and to promote biofilm formation. Quorum sensing (QS) is a mechanism wherein P. aeruginosa secretes small diffusible molecules, specifically acyl homo serine lactones, such as N-(3-oxo-dodecanoyl)-l-homoserine lactone (3O-C12-HSL), that promote biofilm formation and virulence via interbacterial communication...
April 25, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28441606/growth-inhibition-and-antibiofilm-potential-of-ag-nanoparticles-coated-with-lectin-an-arthropod-immune-molecule
#13
Sangily Jayanthi, Sathappan Shanthi, Baskaralingam Vaseeharan, Narayanan Gopi, Marimuthu Govindarajan, Naiyf S Alharbi, Shine Kadaikunnan, Jamal M Khaled, Giovanni Benelli
Lectins from the haemolymph of arthropods, including crustaceans, are molecules potentially involved in the immune recognition and phagocytosis. Here, lectin was purified from the haemolymph of blue swimmer crab Portunus pelagicus, using mannose-coupled sepharose CL-4B affinity column chromatography. In SDS-PAGE analysis, lectin showed a molecular mass of approximately 155kDa. The synthesis of lectin-coated silver nanoparticles (lectin-coated AgNPs) was confirmed by UV-Vis spectroscopy, XRD, FTIR, SEM, TEM, SAED, and EDX analysis...
April 13, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28440922/pseudomonas-aeruginosa-and-post-tracheotomy-bacterial-respiratory-tract-infection-readmissions
#14
Christopher J Russell, Tamara D Simon, Mary R Mamey, Christopher J L Newth, Michael N Neely
OBJECTIVE: Identify risk factors for readmission due to a bacterial tracheostomy-associated respiratory tract infection (bTARTI) within 12 months of discharge after tracheotomy. DESIGN/METHODS: We performed a retrospective cohort study of 240 children who underwent tracheotomy and were discharged with tracheotsomy in place between January 1, 2005 and June 30, 2013. Children with prolonged total or post-tracheotomy length of stay (LOS), less than 12 months of follow-up, or who died during the index hospitalization were excluded...
April 25, 2017: Pediatric Pulmonology
https://www.readbyqxmd.com/read/28440853/antibiotic-strategies-for-eradicating-pseudomonas-aeruginosa-in-people-with-cystic-fibrosis
#15
REVIEW
Simon C Langton Hewer, Alan R Smyth
BACKGROUND: Respiratory tract infection with Pseudomonas aeruginosa occurs in most people with cystic fibrosis. Once chronic infection is established, Pseudomonas aeruginosa is virtually impossible to eradicate and is associated with increased mortality and morbidity. Early infection may be easier to eradicate.This is an update of a Cochrane review first published in 2003, and previously updated in 2006, 2009 and 2014. OBJECTIVES: To determine whether antibiotic treatment of early Pseudomonas aeruginosa infection in children and adults with cystic fibrosis eradicates the organism, delays the onset of chronic infection, and results in clinical improvement...
April 25, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28440700/selection-and-assessment-of-plant-growth-promoting-rhizobacteria-pgpr-for-biological-control-of-multiple-plant-diseases
#16
Ke Liu, Molli Newman, John A McInroy, Chia-Hui Hu, Joseph W Kloepper
A study was designed to screen individual strains of plant growth-promoting rhizobacteria (PGPR) for broad-spectrum disease suppression in vitro and in planta. In a preliminary screen, 28 of 196 strains inhibited eight different tested pathogens in vitro. In a secondary screen, these 28 strains showed broad spectrum antagonistic activity to six different genera of pathogens, and 24 of the 28 strains produced five traits reported to be related to plant growth promotion, including nitrogen fixation, phosphate solubilization, indole-3-acetic acid (IAA) production, siderophore production, and biofilm formation...
April 25, 2017: Phytopathology
https://www.readbyqxmd.com/read/28440622/understanding-carbapenem-translocation-through-occd3-opdp-of-pseudomonas-aeruginosa
#17
Gowrishankar Soundararajan, Satya Prathyusha Bhamidimarri, Mathias Winterhalter
Pseudomonas aeruginosa utilizes a plethora of substrate specific channels for the uptake of small nutrients. OccD3 (OpdP or PA4501) is an OprD like arginine uptake channel of P. aeruginosa whose role has been implicated in carbapenem uptake. To understand the mechanism of selective permeation we reconstituted single OccD3 channels in planar lipid bilayer and characterized the interaction with Imipenem and Meropenem analyzing the ion current fluctuation in presence of substrates. We performed point mutations in the constriction region of OccD3 to understand the binding and translocation of antibiotic in OccD3...
April 25, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28440605/-carbapenem-resistance-in-pseudomonas-aeruginosa-isolated-from-urine-cultures-prevalence-and-risk-factors
#18
J Álvarez-Otero, J L Lamas-Ferreiro, L González-González, I Rodríguez-Conde, M J Fernández-Soneira, A Arca-Blanco, J R Bermúdez-Sanjurjo, J de la Fuente-Aguado
OBJECTIVE: Pseudomonas aeruginosa is a non-fermentative gram-negative bacillus with a great ability to develop resistance to multiple antibiotics, including carbapenems, which is a growing problem worldwide. The aim of this study was to analyse the prevalence of carbapenem-resistant P. aeruginosa (CRPA) in urine cultures and to determine the risk factors associated with the development of carbapanem resistance. METHODS: Positive urine cultures to P. aeruginosa between September 2012 and September 2014 were identified...
April 25, 2017: Revista Española de Quimioterapia: Publicación Oficial de la Sociedad Española de Quimioterapia
https://www.readbyqxmd.com/read/28440203/antimicrobial-biofilm-inhibitory-and-anti-infective-activity-of-metallic-nanoparticles-against-multi-drug-resistant-mrsa-and-pseudomonas-aeruginosa-pa01
#19
Jamuna Bai Ashwathanarayan, Ravishankar Rai Vittal
BACKGROUND: The emergence of drug resistant pathogens is a major concern to the scientific community. Novel approaches such as the use of functionalized nanomaterials with antimicrobial activity is required to treat infectious diseases. OBJECTIVE: In the present study, the metallic nanoparticles (iron, gold, zinc oxide and copper oxide) were evaluated for the antimicrobial, biofilm inhibitory and anti-infective activity against human pathogens methicillin resistant Staphylococcus aureus and Pseudomonas aeruginosa PA01...
April 24, 2017: Pharmaceutical Nanotechnology
https://www.readbyqxmd.com/read/28440108/microbiology-of-the-upper-and-lower-airways-in-pediatric-cystic-fibrosis-patients
#20
Lindsay Sobin, Kosuke Kawai, Alexandria L Irace, Ozgul Gergin, Michael Cunningham, Gregory S Sawicki, Eelam A Adil
Objective To evaluate the microbiology of the upper and lower airways in pediatric cystic fibrosis (CF) patients who underwent sinus surgery. Study Design Retrospective case series with chart review. Setting Tertiary care children's hospital. Subjects and Methods A total of 201 paired sinus and pulmonary cultures from 105 CF patients were identified between 1996 and 2014. Demographics and culture results were analyzed. Results The mean age of patients was 11.2 ± 5.4 years (range, 1-27 years), and approximately one-half were female...
April 1, 2017: Otolaryngology—Head and Neck Surgery
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